Relay UE Inter-Base Station Cross-Link Interference Mitigation
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Solution Overview
Problem
Conventional techniques are inadequate for effectively mitigating inter-base station cross-link interference (CLI) between victim and aggressor base stations in wireless communications systems, particularly when the victim base station cannot reach the aggressor base station due to distance or power imbalances.
Innovation Solution
The use of relay User Equipments (UEs) to relay indications of high CLI from victim base stations to aggressor base stations, enabling communication of CLI through configured resources and beams, and identifying other relay UEs served by the aggressor for multi-hop relaying when direct communication is not possible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional direct communication techniques are used to indicate CLI between base stations, then the signaling is simple, but the victim base station cannot reach the aggressor base station due to distance or power imbalances
Solution Approach 1:
The patent introduces relay UEs as intermediary nodes that facilitate CLI indication communication between victim and aggressor base stations. When direct communication fails due to distance or power imbalance, the relay UE receives the indication from the victim base station and forwards it to the aggressor base station, ensuring reliable delivery while adding minimal complexity to the existing communication architecture.
2Length of stationary object
If relay UEs are used to relay CLI indications, then the effective range of victim base stations is increased, but the system complexity increases
Solution Approach 1:
The patent leverages existing UEs that already have established connections with both victim and aggressor base stations, enabling them to perform multiple functions: normal user communication and CLI indication relaying. This approach extends the effective range without requiring dedicated relay infrastructure, as existing UEs are utilized for the additional relaying function.
Solution Approach 2:
Relay UEs act as intermediaries that bridge the communication gap between base stations separated by large distances or power imbalances. The relay mechanism is integrated into existing communication protocols, allowing UEs to forward CLI indications using their existing uplink and downlink resources, thereby extending range while minimizing added complexity.
3Object-affected harmful factors
If relay UEs forward CLI indications, then inter-gNB CLI is reduced, but power consumption increases
Solution Approach 1:
The relay UEs utilize their existing communication resources and established connections with both base stations to perform the relaying function. The mechanism leverages the UE's own uplink and downlink channels that are already active for normal communication, avoiding the need for separate dedicated relaying resources and minimizing additional power consumption.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first relay user equipment (UE) may be configured to receive a first message including a cross-link interference (CLI) indication associated with CLI experienced by a first base station which is associated with signals transmitted by a second base station. The first relay UE may generate, in response to the first message, a second message including the CLI indication, and may transmitting the second message including the CLI indication. In some cases, the first relay UE may transmit the second message directly to the second base station. In additional or alternative cases, the first relay UE may transmit the second message to an additional relay UE for relay to the second base station.